Have you tried oil on your boobs. See Sliptinge http://www.noogleberry.com/forum/index.php/topic,2095.30.html
"I used to get really dark and noticeable red marks but I've been using a new lotion and it's been working AMAZING for me. I never get red spots or bruising anymore either now. It's called BodyInvest by Norvell. It's a daily moisturizer that's jam packed with antioxidants and all that good stuff like Vitamin B complex, Encapsulated Vitamin C, natural Vitamin C, Lemon peel, Golden seal, aloe vera, cucumber, green tea, yarrow, lavender, Gingko, white willow, Chamomile, Rosemary, Red clover, Ginseng, Calendula, Marigold, Kelp, Garlic, Nettle, St. Johns Wort, Licorice, Alpha Hydroxy Acids and Beta Hydroxy, Vitamin E, Vitamin A, Jojoba oil, Cocoa Butter, Vegetable oil, and Essential oils. It's quite runny which I really like because it makes my breasts VERY slippery and the cups don't pull at my skin as much and I get GREAT suction! The lotions that were thicker and not as runny did not work for me and I always used to get red marks and the dreaded red dots."